Beauty physics with B(s) and Lambda(b)

TL;DR

This paper reviews recent experimental progress in studying B(s) and Lambda(b) hadrons at hadron colliders, focusing on measurements of their properties and oscillation parameters to understand b-quark physics.

Contribution

It reports new measurements of masses, lifetimes, and decay modes of B(s) and Lambda(b), and advances in determining their oscillation and lifetime difference parameters.

Findings

Measured B(s) and Lambda(b) masses and lifetimes.

Observed charmless decay modes.

Progress in determining oscillation frequency and lifetime difference.

Abstract

Although the B(s) and Lambda(b) hadrons differ only in the spectator quarks from the well-studied B(d) and B(u) mesons, they provide a unique window on the physics of the b-quark. With no experiments presently running at the Z pole, hadron colliders now provide the best opportunity to study the B(s) and the Lambda(b). The collider experiments at the Tevatron, CDF and D0, have collected large numbers of B(s) and Lambda(b). Some of their latest preliminary measurements are presented here, including masses, lifetimes, and charmless decays. Progress is made toward measuring the lifetime difference Delta Gamma(s) between the B(s) mass eigenstates and the oscillation frequency Delta m(s).